{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T12:39:10.219Z","years_from_j2000":26.678,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-89839-b","name":"HD 89839 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":186.90815228349013,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":155.168879,"dec_deg":-53.6640291,"epoch_ra_deg":155.425027,"epoch_dec_deg":-53.798924,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 89839","semi_major_axis_km":705054764.6091,"periapsis_km":null,"mass_kg":1.0439685298661964e+28,"mass_msun":0.00525027,"constellation":"Vela","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/hd-89839-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 89839","host_v_mag":7.64,"eccentricity":0.185,"uncertainties":{"mass_kg":[9.110998078832259e+26,1.195818497846734e+27],"distance_ly":[0.3568150772221173,0.358445859110701],"eccentricity":[0.014,0.014],"host_mass_solar":[0.03,0.03],"inclination_deg":[8.3,14],"host_radius_solar":[0.047751,0.053073],"host_temperature_k":[65,65],"semi_major_axis_km":[6731904.181499999,6731904.181499999],"orbital_period_days":[24.6,26.1],"argument_of_periastron_deg":[4.6,4.6]},"host_mass_solar":1.21,"inclination_deg":49.5,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.28588,"planets_in_system":1,"discovery_facility":"Multiple Facilities","host_spectral_type":"F7 V","host_temperature_k":6314,"orbital_period_days":3391.2,"periastron_epoch_bjd":2449842.2,"equilibrium_temperature_k":159.03,"argument_of_periastron_deg":158},"designations":[{"catalog":"Exoplanet","designation":"HD 89839 b"},{"catalog":"Host star","designation":"HD 89839"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}